Please have a look at the patch below.

Taking this opportunity, in addition:
- I removed the useless "volatile" stuff from the non-atomic versions
  of the bit operations.
- I removed the unnecessary barrier() from __clear_bit_unlock().
  ia64_st4_rel_nta() makes sure all the modifications are globally
  seen before the bit is seen to be off.
- I made __clear_bit() modeled after __set_bit() and __change_bit().
- I corrected some comments sating that a memory barrier is provided,
  yet in reality, it is the acquisition side of the memory barrier only.
- I corrected some comments, e.g. test_and_clear_bit() was peaking
  about "bit to set".

Signed-off-by: Zoltan Menyhart, <Zoltan.Menyhart@bull.net>

Thanks,

Zoltan Menyhart